 | The petals of a red rose are much brighter than its leaves by day, but the leaves are brighter at twilight!
白天，红玫瑰的花瓣比其叶子明亮得多，但黄昏时分，叶子却更亮！ |
| | After your eyes have adapted, you might see objects at night. But they appear to have no color.
适应后，你可能会在夜间看到物体。但它们似乎没有颜色。 |
| | You notice a dim star in your peripheral vision, but when you look directly at it, it disappears!
你注意到 peripheral vision 中有一颗暗淡的星体，但当你直接注视它时，它却消失了！ |
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| When gaurding agains a stealthy approach, the person on patrol is advised to watch with peripheral vision.
在防范隐蔽接近时，巡逻人员应留意使用余光观察。 |
| | After a long time of dark adaptation, you can see large objects, but not fine detail.
长时间的暗适应之后，你可以看到较大的物体，但无法看清细节。 |
| | If you are examining a detailed object with reds, greens and intense blue details, the blue will be less distinct.
如果你在观察一个有红色、绿色和强烈蓝色细节的物体，蓝色的细节会不那么清晰。 |
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| Ship captains and airline pilots can see outside better at night if their instrument panels are red.
船长和航空飞行员在夜间如果仪表盘是红色的，可以看到外面更清楚。 |
| | White light and a spectral color produce a color. But that perceived color can be made in many different ways.
白光和一种光谱色可以产生一种颜色。但这种感知到的颜色可以通过许多不同的方式实现。 |
| | Two light sources appear equally white. Yet a colored object may be distinctly different in color in their light.
两个光源看起来同样白。然而，一个有色物体在它们的光下可能颜色差异显著。 |
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| Why is a candle flame yellow?
为什么蜡烛火焰是黄色的？ |
| | Why is the sky blue?
为什么天空是蓝色的？ |
| | Why is the sunset red?
为什么日落时天空是红色的？ |
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